Pete, we have been quite open and honest about this project. As stated earlier in the discussion (see below for reference) we had mixed results at first. Some were spot on, others less so, but all of the issues were resolved one way or another. I'm perfectly happy with the RWD one fitted to my car, the issue which I had with it initially turned out to be a split elsewhere in the system, nothing to do with the manifold itself.
As Bruce mentioned, there are small
power gains to be had simply by bolting on the manifold, but to achieve larger power gains the unit it must be used in conjunction with a less restrictive exhaust, richer carb needles, free-flowing air filters etc etc and then set up on a rolling road for best results. We are not saying that the design of these manifolds is necessarily the very best
for producing more power, we can't prove that, but our main reason for producing them was to address the issue of the lack of availability of new units (FWD). In the case of the RWD manifolds the driver was to eradicate the issue of the troublesome manifold-downpipe joint. In both cases we have achieved what we set out to do. We are genuinely sorry that the manifold didn't meet your expectations, that's very unfortunate. However, despite all the time, money and effort I personally (and others) put into this project, I'm actually quite happy with the result, certainly in the sense that the car seems so much more driveable now.
We had some quality issues with some of these manifolds, some were a perfect fit first time, others needed to be returned to our supplier for adjustment. We think we've nailed them now, but each one will be trial fitted to a cylinder head before they are sold just to make sure that they fit properly.
We want some serious testing to take place before we order a new batch, that will take place next month. If members want one of these manifolds, get your orders in now and they should be ready before TDCIR in September (earlier delivery by arrangement possible).
After extensive testing we're confident that any remaining issues with these manifolds have need been resolved and we are now taking orders for a new batch to be produced.